Could he be interested or am i reading too much into it?

There is this great guy that i work with. Almost everytime we work together, we end up bantering back and forth. For example: the other day, i was sweeping and went on to the aisle he was on, so he said "you seem to be following me." and smiled really big. So i said"no, that must be your age acting up and playing games with your head." so he said " what are you talking about? Im a youngin!" then later that day, i was collecting cardboard and to be nice, went to grab his. He then slammed his hand down so that i couldnt grab it, looked up and smiled. Then grabbed the cardboard and ran to the back to put it away. Its just little things like that. But the thing is, most of the time, i start the bantering. Does it seem like he is interested or should i just move on?